containerztest: remove container during cleanup after stop

[prathapcv]

Summary

• Fixes cleanup behavior in container helper teardown.

• internal/containerztest/containerztest.go Stop() previously stopped containers but did not remove them.
  Problem

• Residual container instances (for example cntr-test-conn created in cntr_test.go) could remain after tests.

• This can cause cross-test interference such as container name/port conflicts in subsequent runs.
  Change

• In internal/containerztest/containerztest.go, update Stop() to call RemoveContainer(ctx, instNameToStop, true) after StopContainer(...).

• Handle NotFound gracefully to keep cleanup idempotent.

Impact

• Applies to tests using containerztest.Setup() cleanup path (including container connectivity and lifecycle tests).
• Improves teardown correctness and reduces stale-resource failures.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the container test helper utility by ensuring that containers are fully removed from the environment during the teardown process. By addressing residual container instances, the change prevents potential naming or port conflicts between subsequent test runs, leading to more reliable and isolated test execution.

Highlights

• Improved Cleanup Logic: Updated the Stop function in containerztest to explicitly remove containers after stopping them.
• Idempotent Teardown: Added graceful handling for NotFound errors during container removal to ensure cleanup remains idempotent and prevents test interference.

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[OpenConfigBot]

Pull Request Functional Test Report for #5810 / 69c3d0b

No tests identified for validation.

Help

[gemini-code-assist]

Code Review

This pull request adds container removal logic to the Stop function in internal/containerztest/containerztest.go to clean up containers after they are stopped. The feedback suggests a minor improvement to use status.Code(err) directly for cleaner and more idiomatic gRPC error handling when checking for the NotFound status.